Asked by Andile

The sum of the first and second terms of an geometry series is 9.the sum to infinit is 12.calculate the possible values of r.

Answers

Answered by Reiny
a + ar = 9
a(1+r) = 9
a = 9/(1+r)

a/(1-r) = 12
a = 12(1-r)

12(1-r) = 9/(1+r)
1 - r^2 = 3/4
4 - r^2 = 3
-r^2 = -1
r = ± 1
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